Glass Intake / Outlet.

The filter i'm attaching it to (Tetratec Ex700), uses a pipe with 11.3mm internal diameter. However the glass is available in 10mm (too small), or 13mm. If i heated up the pipe, would it stretch to fit over a 13mm diameter?

i tried fitting a fluval spray bar on to some 16mm clear piping, i heated it in boiling water and it didnt budge, it just made it loose if that makes sense. It was the exact same diammeter as the spray bar.